Electric-arc lamp



` (No Model.)

P. F. H. QUEISSBR.

ELEGTRIG ARG LAMP.

nted 1360.22, 1896.

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UNITED STATESv PATENT OFFICE.

PAUL FRANZ IIERRMANN QUEISSER, OF CIIARLOTTENBURG, GERMANY, AS-

SIGNOR TO TIIE SIEMENS di HALSKE ELECTRIC COMPANY OF AMERICA,

OF CHICAGO, ILLINOIS.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 573,617', dated December 22, 1896.

Application filed January 24,1896. Serial No. 576,642. (No model.)

To @ZZ whom it may concern:

Beit known that I, PAUL FRANZ HERR- MANN QUEIssER, a subject of the Emperor of Germany, residing at Charlottenburg, near Berlin, Germany, have invented new and useful Improvements in Arc-Lamps, (Case No. 14,) of which the following is a specification.

My invention relates to an arclamp, its object being to provide an improved construction of feeding and regulating mechanism for an arc-lamp adapted to be supplied with an alternating current.

In Letters Patent No. 412,141, dated October 1, 1889, is illustrated a lamp wherein the I5 upper carbon is suspended from a band which winds about a drum mounted upon a pivoted armature-lever, the drum being normally maintained against rotation, but adapted to be released when the armature is attracted 2O by the magnet opposite the pole of which it is placed. The magnet is connected in shunt with the arc and, as the arc lengthens and the resistance of the arc increases, more and more current is diverted through the shunt feeding and regulating magnet until the armature is attracted sufficiently to release the drum and permit the upper carbon to be fed toward the lower carbon.

In the lamp illustrated in the above-mentioned patent the armature rests opposite the end of a magnet the coils of which are adapted to be traversed by a direct or continuous current.

The lamp of the present invention is adapted to be traversed by an alternating current, and the invention embodies certain structural features whereby the efficient operation of the lamp when traversed by an alternating current is effected. The core of the regulating and feeding electromagnet is of a U shape and is formed from laminated plates. The upper ends of the core are cut away to present two oblique faces to the armature, which is also made of laminated plates mounted upon the end of the armaturedever. The armature is adapted to vibrate between the ends of the poles of the core, and the arma ture is so mounted that its axis is approximately parallel to the oblique faces of the ends of the core. The sides or faces of the armature toward the poles are tapering, whereby the air-spaces between the edges of the core and the tapering faces of the armature gradually decrease as the armature is drawn toward the core. The pull upon the armature is thus maintained practically uniform throughout the working travel of the armature, as the air-space is a maximum when the armature is in the position where the greatest pull is exerted by the poles of the magnet- 6o core, the air-space being a minimum when the armature is entirely drawn in, in which position the pull exerted by the poles is a minimum. The core and the armature being formed of laminated sheets or plates, the production of eddy currents and consequent heating of the iron upon the passage of alternating currents is prevented.

I have illustrated my invention in the accompanyin g drawings, in which` 7o Figure 1 is a view of the lamp mechanism of my invention. Fig. 2 is an end view of the magnet and armature. Fig. 3 is a view in elevation of the magnet and the armature. Fig. 4 is a top view of the magnet and arina- 75 ture.

Like letters refer to like parts in the several figures.

rlhe armature-lever a is pivoted to a standard or supporta', and the drum ZJ is journaled 8o to the armature-lever a at Z1. Around the drum b is wound a band or ribbon c, upon the lower end of which is mounted the upper carbon. Upon the end of the armature-lever a is mounted the armature d, the armature being composed of thin plates held between the plates d and d2 by means of screws d4. The armature vibrates between the poles of the core c, which is of U shape and carries the magnet-coils e' c. The core is laminated, 9o being made up of thin U-shaped plates or stampings. The ends or poles e2 c3 of the core e are oblique, the plane of the ends being approximately parallel to the axis of the armature d. The faces of the armature opposite the edges of the poles are tapered, whereby, when the armature rests in a retracted position, the air-spaces between the edges of the poles and the faces of the armature are of greater width than when the armature is atroo traeted. ot' the eleetromagnet andthe armaturedever (i thus moves, due to the Opposing actions ot the niagnetand Sp1-in g (/1 A pallet'I ry en gages a pallet-wheel 5]', geared to move n'itii the drinn Z1 to regulate and control the movement oit' the drinn in feedingl tlie earbons together. llie pallet g Carries a tongue q?, adapted to engage a Stationary eontaet rr/fi, to maintain tlie pallet against oscillation when the armature is retracted. The pallet y] is mounted upon a `frame movin g with t-lxe armature-lover (i, and when tlie armature is attracted the Aframe is moved to earry the tongue g1 ont ol' engagement with the eontaetf/i, thns permiting the pallet to oseillate and :l'eed the ribbon to Cause the eat-bons to i'eed together.

Having described my invention, n'liat l; elaim as new, and desire to Seenreby .lietters g Patent, is"

ln an 'ire-lz'nnp Vthe combination nitli an A .spring f oppose the attraction i eleetromagnot 'having a laminated eoro, the

two en( .e of wllieli are ent away obliql'iely Vin one plane, ol a pivoted armaterelever, tile movement of which controls tlie ifet'iding ot tlle Carbone7 and tlielaniinated aifnmtnre earried upon Said lever and adapted to vibrate between tile parallel polos ot' said eorey the axin of tlioarinatnre being enbntantially parallel to 'tlie oblirpie .l'aee of the ends or poles ot tlie eoro, tile Vlaee oi the :'nfn'latnre oppoed to the parallel edges ot' Said poles being tapered to thereby graduallyv deeroaSo tlie a irn gaps the armature is attiaeted; snlnslaw tially as described.

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